I need some RF advice. Which of the inexpensive transmitters/receivers out there perform the best in an extreme EMI environment such as near a TIG welder with high frequency start operating. Is there one modulation scheme more resistant to EMI than the rest? I want to transmit a single control command to a receiver to set a digital pot. I have everything working on the bench, but haven't been able to find an RF link that will withstand the EMI. As they say "...RF is FM (F'n Magic)"